Séminaire

I will present selected field theoretical aspects and Bayesian model selection studies in a particular class of modified gravity theories, so-called nonlocal gravity theories. In particular, I will focus on three nonlocal gravity models that have been proposed for explaining the late-time acceleration of the expansion of the universe and have been shown to provide a statistically equivalent fit to LCDM given recent cosmological data.

Abstract:
It is now recognized that primordial black holes (PBHs) may be produced in various models of inflation in the early universe. In this talk, I review several different scenarios of PBH formation from inflation, each of which has rather distinct features. Then I discuss how these models may be observationally tested in the not-so-distant future, particularly by gravitational wave observations.
 

Abstract. I’ll show the analysis we perform on gravitational microlensing signatures and how we estimate gravitational microlensing parameters to obtain information about several components of the dark matter in our galaxy like free-floating planets, brown dwarfs, primordial black holes, making use of actual and future space-based telescopes: Euclid, THESEUS, Gaia, Roman, etc.

On Monday, September 19 at 14.00 we will be welcoming Jakub Klencki (ESO Garching and Max Planck Institute for Astrophysics Garching) for the gravitation group seminar. The seminar will take place online, (the zoom link can be found below). 

Title: From massive stars through X-ray binaries to gravitational-wave sources

Abstract: 

Next week we will be welcoming François Larrouturou (DESY Hamburg) for the Gravitation group seminar. 
The seminar will take place in person, in room 371A-Klein (the zoom link can be found below) next Monday, July 11 at 10:00. 

François will give an introduction to: 

Title : Minimalism as guideline to construct new paradigms.

Abstract : 

We will be welcoming Riccardo Buscicchio (Università di Milano-Bicocca and INFN, Sez. di Milano-Bicocca) for the Gravitation group seminar. This seminar will take place online (the zoom link can be found below) next Monday, June 13 at 10:00 am CEST. 

Riccardo will give an introduction to: 
Title:  Stellar mass binary black holes: what, when, and where

Abstract

We will have several talks by PhD students at the theory group:

1:30 p.m.: Konstantin Leyde, "A window for cosmic strings"

As an extension of Gabor signal processing, the covariant Weyl-Heisenberg integral quantization is implemented to transform  functions on the eight-dimensional  phase space (x,k) into Hilbertian operators. The x=(x^{\mu}) are space-time variables and the k=(k^{\mu}) are their conjugate wave vector-frequency variables. The procedure is first applied to the variables (x,k) and produces canonically conjugate essentially  self-adjoint operators.